What are the essential ingredients of a public-key directory?

  1. The authority maintains a directory with a entry for each participant.
  2.  Each participant registers a public key with the directory authority.
  3. A participant may replace the existing key with a new one at any time.
  4. Periodically, the authority publishes the entire directory or updates to the directory.
  5. Participants could also access   the directory electronically.


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